I just recently finished a mod, which I can open in the GECK and see in the Data Folder, but it doesn't appear in the Data Files option on the launcher.
Also, I deleted some mods in the data folder, but they still appear on the launcher.
If anyone knows how to fix this, or even what this is, it wold be greatly appreciated.

P.S. Sorry if this is an obvious answer in the end, I'm brand-new to the GECK.